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                B君的技巧                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><div>给出一个n，保证n=2^K（K为整数），和一个n*n的方阵Wi,j保证Wi,j=0(0&le;i&lt;n)且Wi,j=Wj,i(0&le;i，j&lt;n)求出一个</div>
<div>0，1&hellip;n一1的排列Pi，使得&sum;(Wpi-1,Pi)最小。但是这个排列还要满足一个特殊的条件：那就是对于所有的j(0&le;J</div>
<div>&le;K，从前往后分成2^(K-j)块，每块长度2^j，对于任意一块i，包含Pi2^<sup>j</sup>，Pi2^<sup>j+1</sup>，&hellip;，P(i+1)2^<sup>j-1</sup>，这些数</div>
<div>的二进制第J位（最低位是第0位）都一样。比如3，2，0，1是满足条件的，而3，0，1，2不满足因为当j=l时，分</div>
<div>成的第一块3，0的第j=l位不相等，3的第1位是1而0的第1位是0。</div>
<p></p></p><hr/><h3>输入格式</h3><p><div>第一行一个K。从第二行开始，一个n&times;n的矩阵。</div>
<div>2&lt;=k&lt;=9,矩阵是关于主对角线对称的，每一项Wi,j在[0,1000000]</div>
<p></p></p><hr/><h3>输出格式</h3><p><div>第一行一个整数表示答案</div>
<p></p></p><hr/><h3>样例输入</h3><pre>2
0 7 2 1
7 0 4 3
2 4 0 5
1 3 5 0</pre><hr/><h3>样例输出</h3><pre>13
【样例解释】
序列为1，0，3，2
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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